LVS-DR實戰：搭建HTTP和HTTPS負載均衡叢集
阿新 • • 發佈：2020-07-26
目錄
LVS-DR實戰：搭建HTTP和HTTPS負載均衡叢集
DR模式是通過director將報文源和目標MAC地址修改，傳送給RS，RS將響應報文直接傳送給client。
環境說明：
| LVS伺服器（DR） | DIP：192.168.32.125 | VIP：192.168.32.250 |
|---|---|---|
| apache伺服器（RS） | IP：192.168.32.130 | VIP：192.168.32.250 |
| apache伺服器（RS） | IP：192.168.32.135 | VIP：192.168.32.250 |
三臺機器分別配置了對應的本地靜態地址DIP和RIP，VIP之後配置
1. 搭建lvs-dr模式的http負載叢集
LVS伺服器配置要點
LVS是被編譯進核心中，主要分為兩部分ipvs和ipvsadm，ipvs是LVS軟體核心，是執行在LB上的，這是個基於ip層的負載均衡；ipvsadm是使用者空間的叢集管理工具。
要想起到負載均衡效果，那麼所有請求報文必須發往LVS伺服器(DS)，然後DS根據指定演算法分發到後端伺服器上，因此DS必須配置VIP地址，VIP是與公網client通訊地址，這樣DS才能接受到請求報文進行分發。
一定要先設定好核心引數在配置VIP，如果先配置VIP，VIP配置好後會立即通告給所有人，而修改核心引數就是為了不通告
LVS-DR模式的注意情況：
VS 的VIP 和 RS 必須在同一個網段，不然廣播後所有的包都會丟掉： 提前確認LVS/硬體LB 是什麼模式，是否需要在同一個網段 所有的RS都必須繫結VIP的IP地址，否則RS收到package後發現dst 不是自己的IP，所有包都會丟掉。 RS處理完包後直接把package 通過dst IP 傳送給 client ，不通過LVS/迎接IP 了這樣的LVS /VIP 效率會更高一點。【通過把realserver的ip暴漏給外界，不是很安全】
1.1 LVS上配置IP
[root@DR ~]# ip addr add 192.168.32.250/32 dev eth0
[root@DR ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:39:18:a9 brd ff:ff:ff:ff:ff:ff
inet 192.168.32.125/24 brd 192.168.32.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
inet 192.168.32.250/32 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe39:18a9/64 scope link
valid_lft forever preferred_lft forever
//開啟埠轉發
[root@DR ~]# sysctl -p
net.ipv4.ip_forward = 1
1.2 RS上配置arp核心引數
[root@RS-1 ~]# vim /etc/sysctl.conf
#新增以下兩行
net.ipv4.conf.all.arp_ignore = 1
# 將對應網絡卡設定為只回應目標IP為自身介面地址的ARP請求
net.ipv4.conf.all.arp_announce = 2
# 將ARP請求的源IP設定為eth0上的IP，也就是RIP
[root@RS-1 ~]# sysctl -p
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
##兩臺RS都要進行以上操作
[root@RS-2 ~]# echo 'net.ipv4.conf.all.arp_ignore = 1' >> /etc/sysctl.conf
[root@RS-2 ~]# echo 'net.ipv4.conf.all.arp_announce = 2' >> /etc/sysctl.conf
[root@RS-2 ~]# sysctl -p
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
1.3 RS上配置VIP
一定要先設定好核心引數在配置VIP，如果先配置VIP，VIP配置好後會立即通告給所有人，而修改核心引數就是為了不通告
LVS伺服器的eth0網絡卡的IP:192.168.32.250作為VIP
兩臺RS上都要做
[root@RS-1 ~] ip addr add 192.168.32.250/32 dev lo
[root@RS-2 ~] ip addr add 192.168.32.250/32 dev lo
#永久生效在配置檔案中加IP
所有RS上都要做
[root@RS-1 ~]# route add -host 192.168.32.250/32 dev lo
#永久配置
echo '192.168.32.250/32 via dev lo' > /etc/sysconfig/network-scripts/route-lo
[root@RS-2 ~]# route add -host 192.168.135.131/32 dev lo
1.4 DR上配置lvs-dr轉發規則
#LVS依賴於ipvsadm來進行配置，所以我們首先先安裝ipvsadm
[root@DR ~]# yum -y install ipvsadm
[root@DR ~]# ipvsadm -A -t 192.168.32.250:80 -s rr
[root@DR ~]# ipvsadm -a -t 192.168.32.250:80 -r 192.168.32.130:80 -g
[root@DR ~]# ipvsadm -a -t 192.168.32.250:80 -r 192.168.32.135:80 -g
[root@DR ~]# ipvsadm -Sn
-A -t 192.168.32.250:80 -s rr
-a -t 192.168.32.250:80 -r 192.168.32.130:80 -m -w 1
-a -t 192.168.32.250:80 -r 192.168.32.135:80 -m -w 1
[root@DR ~]# ipvsadm -Sn > /etc/sysconfig/ipvsadm
1.5 RS上配置http並啟動
[root@RS-1 ~]# yum -y install httpd
[root@RS-1 ~]# echo 'rs1' > /var/www/html/index.html
[root@RS-1 ~]# systemctl start httpd
[root@RS-2 ~]# yum -y install httpd
[root@RS-2 ~]# echo 'rs1' > /var/www/html/index.html
[root@RS-2 ~]# systemctl start httpd
1.6 客戶端訪問測試
[root@localhost ~]# for i in $(seq 10);do curl 192.168.32.250:80;done
rs2
rs1
rs2
rs1
rs2
rs1
rs2
rs1
rs2
rs1
搭建https的負載叢集
在以上配置基礎下搭建https
1. LVS伺服器搭建CA服務端
1.生成金鑰對
[root@DR ~]# cd /etc/pki/CA/
[root@DR CA]# (ls)
certs crl newcerts private
[root@DR CA]# (umask 077;openssl genrsa -out private/cakey.pem 2048)
Generating RSA private key, 2048 bit long modulus
.................................+++
.........................................................................................+++
e is 65537 (0x10001)
[root@DR CA]# openssl rsa -in private/cakey.pem -pubout
writing RSA key
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxBHetLa8VvcmikZNDbG/
tXsbrxvCBsMnsMcwqCKLupcZiRhlUgjY+AAYPrBM5sE8jlJAW/mEGZc1fHG30ruU
5Lnbh2NeHrHJZUuZS6WYCslDKzd0KRDW2GR43CtfqLmFc8g+3DWIqEdeXrH29o5L
cm4AsfeqjBQaNIoNXKcnl/7Yc0mJK+yp3AHO4EFadXTQF+nx6A0mfVRw254h4lgP
6YdL3izUlG2JZ5kqZfytMzG1lKz+O651alNo+Lq14mSKxJArLAT5mWvJ/JJXH/7q
qIHk1RPHQ2XkZyk7QONhjLfZN9aY1h3EawAoBH8etbasbUoPWaUeV+wxzDqPF4pY
qQIDAQAB
-----END PUBLIC KEY-----
2.生成自簽署證書
[root@DR CA]# openssl req -new -x509 -key private/cakey.pem -out cacert.pem -days 1024
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:HB
Locality Name (eg, city) [Default City]:WH
Organization Name (eg, company) [Default Company Ltd]:runtime
Organizational Unit Name (eg, section) []:runtime
Common Name (eg, your name or your server's hostname) []:runtime
Email Address []:
[root@DR CA]#
[root@DR CA]# touch index.txt && echo 01 > serial
3.RS生成證書籤署請求，併發送給CA
#RS-1（httpd伺服器）生成金鑰
[root@RS-1 ssl]# (umask 077;openssl genrsa -out httpd.key 2048)
Generating RSA private key, 2048 bit long modulus
...................................................................................................................................................................................................................................................+++
................+++
e is 65537 (0x10001)
#RS-1（httpd伺服器）生成證書籤署請求
[root@RS-1 ~]# mkdir /etc/httpd/ssl
[root@RS-1 ~]# cd /etc/httpd/ssl
[root@RS-1 ssl]# openssl req -new -key httpd.key -days 1024 -out httpd.csr
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:HB
Locality Name (eg, city) [Default City]:WH
Organization Name (eg, company) [Default Company Ltd]:runtime
Organizational Unit Name (eg, section) []:runtime
Common Name (eg, your name or your server's hostname) []:runtime
Email Address []:
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
[root@RS-1 ssl]#
[root@RS-1 ssl]# ls
httpd.csr httpd.key
#把證書籤署請求檔案傳送給CA
[root@RS-1 ssl]# scp httpd.csr [email protected]:/root
4.CA簽署證書併發給客戶端
[root@DR ~]# ls
anaconda-ks.cfg httpd.csr
[root@DR ~]# openssl ca -in /root/httpd.csr -out httpd.crt -days 1024
Using configuration from /etc/pki/tls/openssl.cnf
Check that the request matches the signature
Signature ok
Certificate Details:
Serial Number: 1 (0x1)
Validity
Not Before: Jul 24 15:27:28 2020 GMT
Not After : May 14 15:27:28 2023 GMT
Subject:
countryName = CN
stateOrProvinceName = HB
organizationName = runtime
organizationalUnitName = runtime
commonName = runtime
X509v3 extensions:
X509v3 Basic Constraints:
CA:FALSE
Netscape Comment:
OpenSSL Generated Certificate
X509v3 Subject Key Identifier:
51:C2:11:E1:0D:86:FB:40:79:0B:F3:DD:5E:49:71:C6:D3:88:41:B1
X509v3 Authority Key Identifier:
keyid:31:D2:0A:8F:D2:DD:B9:3E:EE:05:B5:1B:58:C4:AF:8C:45:3B:C8:A0
Certificate is to be certified until May 14 15:27:28 2023 GMT (1024 days)
Sign the certificate? [y/n]:y
1 out of 1 certificate requests certified, commit? [y/n]y
Write out database with 1 new entries
Data Base Updated
[root@DR ~]# ls
anaconda-ks.cfg httpd.crt httpd.csr
#CA把簽署好的證書httpd.crt和服務端的證書cacert.pem發給客戶端
[root@DR ~]# scp httpd.crt [email protected]:/etc/httpd/ssl
[root@DR ~]# scp cacert.pem [email protected]:/etc/httpd/ssl
2.配置https
1.將RS-1的證書和金鑰發給RS-2
[root@RS-2 ~]# yum -y install mod_ssl
[root@RS-2 ~]# mkdir /etc/httpd/ssl
[root@RS-1 ~]# yum -y install mod_ssl
[root@RS-1 ssl]# ls
cacert.pem httpd.crt httpd.csr httpd.key
[root@RS-1 ssl]# scp cacert.pem httpd.crt httpd.key [email protected]:/etc/httpd/ssl
[email protected]'s password:
cacert.pem 100% 1294 1.4MB/s 00:00
httpd.crt 100% 4416 5.4MB/s 00:00
httpd.key
#RS-2上檢視
[root@RS-2 ~]# ls /etc/httpd/ssl/
cacert.pem httpd.crt httpd.key
2.修改https配置檔案
[root@RS-1 ~]# vim /etc/httpd/conf.d/ssl.conf
//修改後如下所示
# Server Certificate:
# Point SSLCertificateFile at a PEM encoded certificate. If
# the certificate is encrypted, then you will be prompted for a
# pass phrase. Note that a kill -HUP will prompt again. A new
# certificate can be generated using the genkey(1) command.
SSLCertificateFile /etc/httpd/ssl/httpd.crt
# Server Private Key:
# If the key is not combined with the certificate, use this
# directive to point at the key file. Keep in mind that if
# you've both a RSA and a DSA private key you can configure
# both in parallel (to also allow the use of DSA ciphers, etc.)
SSLCertificateKeyFile /etc/httpd/ssl/httpd.key
# Server Certificate Chain:
# Point SSLCertificateChainFile at a file containing the
# concatenation of PEM encoded CA certificates which form the
# certificate chain for the server certificate. Alternatively
# the referenced file can be the same as SSLCertificateFile
# when the CA certificates are directly appended to the server
# certificate for convinience.
#SSLCertificateChainFile /etc/pki/tls/certs/server-chain.crt
# Certificate Authority (CA):
# Set the CA certificate verification path where to find CA
# certificates for client authentication or alternatively one
# huge file containing all of them (file must be PEM encoded)
SSLCACertificateFile /etc/httpd/ssl/cacert.pem
#重啟服務
[root@RS-1 ~]# systemctl restart httpd
[root@RS-1 ~]# ss -tanl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::]:443 [::]:*
LISTEN 0 128 [::]:80 [::]:*
LISTEN 0 128 [::]:22 [::]:*
RS-2上也要做如上配置
3. LVS上配置規則
[root@DR ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.32.250:80 rr
-> 192.168.32.130:80 Masq 1 0 0
-> 192.168.32.135:80 Masq 1 0 0
[root@DR ~]#
[root@DR ~]#
[root@DR ~]#
[root@DR ~]#
[root@DR ~]#
[root@DR ~]# ipvsadm -A -t 192.168.32.250:443 -s rr
[root@DR ~]# ipvsadm -a -t 192.168.32.250:443 -r 192.168.32.130 -m
[root@DR ~]# ipvsadm -a -t 192.168.32.250:443 -r 192.168.32.135 -m
[root@DR ~]#
[root@DR ~]#
[root@DR ~]#
[root@DR ~]#
[root@DR ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.32.250:80 rr
-> 192.168.32.130:80 Masq 1 0 0
-> 192.168.32.135:80 Masq 1 0 0
TCP 192.168.32.250:443 rr
-> 192.168.32.130:443 Masq 1 0 0
-> 192.168.32.135:443 Masq 1 0 0
4. 客戶端訪問測試
curl 可以使用-k引數不驗證證書的合法性
[root@localhost ~]# for i in $(seq 10);do curl http://192.168.32.250;done
rs2
rs1
rs2
rs1
rs2
rs1
rs2
rs1
rs2
rs1
[root@localhost ~]# for i in $(seq 10);do curl -k https://192.168.32.250;done
rs2
rs1
rs2
rs1
rs2
rs1
rs2
rs1
rs2
rs1